Control system for projectors and the like.



J. L, HALL. CONTROL SYSTEM FOR PROJECTORS AND THE LIKE.

APPLICATION FILED APR. 7, 1910.

Patented Ma?. 26, 191.2.

' coil.

Y relay C and thereby controlling the contactors 9 and 10, I providetheV two controllers E and F. Controller E is driven by the motor 3 bymeansl of a bevel gear 21, while the controller F is driven manually'through the hand wheel'22. The controller E consists of two groups ofcontacts 23, 23', etc.Y and 24, 24', etc. These contacts'are mountedconcentrically as shown, and are insulated from each other. I have shownthe controller as consisting of two concentric sets of four contactseach, although it is obvious that thisnumber may be, va-- ried asdesired. These contacts are adapted to be rotated from, the bevel gearV21 by mechanism not shown. The stationary contacts consist of two pairs,25A and 26, two for each set of contacts. The inner con* tactslof thepairs are both connected with one terminal of the moving coil 17. Theother two contacts are connected with the contact segments on thecontroller F. rEhis controller Fconsists ofv a controlling member 27pivoted at 28, and a contact ring 29 having concentric contact segments30 surrounding it. The movable member 27 is provided with a brush 31 forengaging the segments 30 and a brush 32 :tor engaging the contact ring29. The member 27 is loosely mounted on the pivot 28 and is providedwith three contact pins 33, 34 and 35. Contact pin 34 is electricallyconnected with brush 32, while pins 33 and 35 are electrically connectedwith brush 31. lSecured to the pivot pin .28' is a forked member 36having its ends project-ing between the contact pins 33, 34, andv 35.This member 36 is arranged to be rota-ted by m/eans of the hand Wheel 22through mechanism notshown, and is provided with two brushes 37V and 38engaging Contact rings 39 and 40,

respectively.'A The arrangement is such that whenA the handle 22 isturned, the member 36 is moved either in one direction or the otheruntil it engages the contact pins on the member 27 and `then forces themember 27 along with it, thus making a lost motion connection betweenthe handle 22 and the member 27. The alternate segments ci thiscont-roller are in electrical connection so that if the member 27 ismoved to the right from the position shown the drawing, the brush 31 isin electrical connection with four of the contacts 30, while if it ismoved to the lett, it is in electrica-l connection with the fo'uralternate contacts.Y The contact ring 39 is connected to one side ot abattery 41, while the'ring 40 is connected to the opposite side of thebattery. Nhile I have shown a battery Vas supplying the controllingcurrent, it is obvious that any other source of current may be employed;

The arrangement of circuits and mode of operation are as follows: lvhenit is desired to move the projector, the hand wheel is turned in theproper direction. Assuming that the hand wheel is turned so as to movethe member 27 in a.counter-clockwise direction, the forked member 36will first engage the contact pins 33 and 34 andwillthen thesegment30.Assuming at this moment that the controller Eis in the position shown, acircuit will be completed as follows: from thepositive lside of thebatter to contact ring 40, brush 38, pin, 34, brus 32, contact ring 29,thence through the. coil 17 to conductor 42, through contacts 25 andsegment 23, conductor 43, 4segment 3Q', brush 31, contact; pin 33, brush37, contact fforce the member 27 into engagement with l ring 39, back tothe negative side of the battery. The coil 17 being energized, thecontact member 18 is moved, as, for ins stance, to the right, so as tobridge contacts 19. This energizes the. solenoid 11 from the line athrough conductor 44, contacts 19,

back to the positive main through conductor 45. The solenoid 11 beingenergized,

bridging contacts 13 and 14 are raised to'.

close the armature circuit of the motor 3 as follows: from the line Aofa'to contact 14,

thence `through the armature of the motor and Contact 13 back to line b.This start-s the motor and shifts the projector in a hoi-if zon'talplane. Assoon as the motor starts,

the'controller E is likewise rotated so that after the projector hasmoved through a predetermined are, the circuit vof the 4motor is brokenby contacts 25 passing on to the,

insulation between 'the segments. In the mean time the contacts 26 havepassed ,of'

of the insulation between the Contact .seg-:1

ments and on to the conducting segment'.

l1ers The arrangement is such that after the' con- A troller F is movedon to segment 30 the motor circuit is broken at., the contacts l25before it can be broken at segment 30. In

other words, the operating handle 22 can-,-

ping of the contacts 13 and 14. The dropy ping of contact 14 shortcircuits the.. armature of lthe motor and Lquickly stops it. The handwheel 22 may now be moved on to the next segment 31 andV in doing so acircuit the relay. This time, however, instead of the current passingthrough the contacts 25, it passes through the contacts 26, since thecontactsI are on insulation. VCurrent passes, as above, lthrough theAcoil 17, conductor 42, thence through the contacts 26 and conductoli-,segment 31', and so on, 130

is again completed through the coil 17 Aof equal arc and to thelnegative side of the battery. The motor Will now start again and movethrough a similar arc until the motor has been stopped as before. Inthis Way, every time the controller is moved through aicertain arc,inthis case one-eighth of a revolution, the controller' E is movedthrough an the projector is correspondingly moved. The gearing betweenthe motor and the projector is preferably such that the latter will` bemoved through a very small angle by a completerevolution of thecontroller F, so that as it moves very slowly, the pauses may bepractically imperceptible. lt, now, it is desired to reverse theoperation of the motor and thereby reverse' the projector, the handWheel is operated in the opposite direction. This throws the member 36into engagement contacts 26, conductor 42, coil`l7, thence to brush S2,-pin Sel, brush 37, back to the negative side of the battery. Eachtime-in reversing a complete segment must be first passed over. rl`hisWill reverse the relay C and bridge contacts 2O vhereby the solenoid l2is energized and the circuit completed through the 'armature 'in theopposite direction. rlhe projector will now be moved forward in theopposite direction, as above. lt will be seenl that by moving the handWheel in one direction through a predetermined arc, the projector l ismoved forward proportionately, and "if the hand Wheel is reversed themotion is likewise reversed. lt is obvious, of course, that training ina vertical plane will be accomplished in a similar manner and it isunnecessary to give a detailed, description thereof.

The mechanism for accomplishing the synchronous motion for reversing thedirection of operation is exceedingly simple, and While I have shown myinvention embodied in concrete form for purposes of illustration, itshould be understood'that l do not limit my invention thereto, sincevarious modilications thereof Will suggest themselves to those skilledin the art without departing from the spirit of my invention, the scopeoit which is set forth in the annexed claims.

Tvhat I claim as nevv and desire to secure bv Letters Patent ot theUnited States, is 1- 1. The combination with a projector' or with Vthepins 34 and but this movement alone does not energize the like, of meansfor training the same comprising an electric motor for driving theprojector, a circuit controller therefor driven by said motor andarranged to break the motor circuit after a predetermined movement, anda (seco-nd controller for closing a circuit through said motor and thefirstcontroller in various positions through the same conductor. A

2. The combination with a projector or the like, ot means for trainingthe same comprising an electric motor tor driving the projector, acircuit controller therefor driven Vbv said motor and arranged tointermittently break the circuit after predetermined moyements, a secondcontroller, a. pair of conductors connecting said controllers, andconnections whereby the' motor circuit is consecutively closed by thesecond controller through said conductors alternately.

The combination With a projector or the like, ot means for training thesame comprisingan electric motor, Aa pair of circuit controllingdevices'opera-ted by said motor and arranged to alternately break themotor circuit after predetermined movements, and an independentlyactuated. circuit controlling dcvice for continuously closing the motorcircuit through the moto-r operated devices alternately.

4. The combination with a projector or the like. of means for: trainingthe same comprising yan electric motor, and controlling means therefor,said means including independently operated controlling devices, one ofwhich is driven by the motor, and aV pair of conductors connecting saiddevices in series, said devices being arranged to alternately make and.break the motor circuit first through one conductor and then throughtheother conductor. j

5. The combination with a projector or the like, of means for trainingthe same comprising an electric motor, a circuit controller therefordriven'by said motor having two ,sets olE contacts operating alternatelyto break the .motor circuit, and a manually operated circuit controllerhaving corresponding contacts which consecutively close the motorcircuit first through a contact of one set and then through a contact ofthe other set. s

6. The combination with a projector or the like, of 'means for trainingthe same comprising an electric nidtor. a circuit controller-therefordriven by said motor having tvvc'sets of contacts arranged in parallelto alternately break the motor circuit, and a manually operated circuitcontroller having corresponding contacts ,which consecutively close themotor circuit lirst through a contact or one set and then through acontact of the other set.`

7. The combination With a projector or, like, ot means Jtor training thesame' the licoA comprising an electric motor, a circuit con'- trollertherefor driven by said motor arranged -o make two simultaneous contactsduring a portion of the movement and break said contacts alternately,and a Secondcircuit controller arranged to complete the circuit through'said contacta alternately.

S. The combination with 'a projecor or the like, of means for trainingthe same comprising an electric motor, a rot-ary circuit controllertherefor driven by said n10- tor arranged to make two simultaneouscontacts during a portion of the rotation and ybreak said contactsalternately andY second V 'circuit controller arranged to complete acircuit` through said contacts alternately by continuous rotation.

9. rEhe` combination with a projecicr or the like, of means for trainingthe same (':oinprisi'ng' an electric motor, a polarized relay forcontrolling the inotor circuit for forward and reverse operation, acircuit. controller driven by the motor arranged to break the circuit`of ihe relay after predeterinined movement, and a second coni-roller forclosingI the circuit ihrough thc relay in eiiher dncction.- l0. Thecombination wlth a progector or `the like. of means for trainine' thesaine couiprisinfc)` an. electric motor, a polarized relay forcontrolling the motor circuit for forwardV and reverse operation, acircuit controller driven by the motor arranged t0 consecutively breakthe .circuit of the .relay after predetermined movements, and a secl ondcontroller for consecutively closing the circuit of the relayin eitherdirection.

ll. The combination with a projector or the like, of means for trainingthe same comprising an electric motor, a polarized re- 40 lay forcontrolling the motor circuitfor forward and reverse operation, arot-ary circuit controller for said relay driven by said motor andarranged to make two simultaneous contacts dnrincra oortion of therotation and break said contact-s alternately, and av manually operatedcircuit, controller`a1*-' ranged to complete a circuit through Saidcontacts alternately to energize said relay continuous rotation in onedirection and to complete a circuit through said cont-acts alternatelyto reverse said relay by continuous rotation in the opposite direction.

ln Witness whereof, I have hereunto set my hand this 6th day of April,1910.

JOHN L. HALL.

lnnJAMIN B. HULL, Hanan Oaronn.

